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How Wastewater Processes can be Optimized Using LOQO

In: Recent Advances in Optimization

Author

Listed:
  • I. A. C. P. Espírito-Santo

    (Minho University)

  • Edite M. G. P. Fernandes

    (Minho University)

  • M. M. Araújo

    (Minho University)

  • E. C. Ferreira

    (Minho University)

Abstract

Summary This paper describes the optimization of an activated sludge system which comprises an aeration tank and a secondary settler. This system is by far the most widely used biological process in wastewater treatment plants. The optimization process is represented as a smooth nonlinear problem with highly nonlinear equality constraints, some linear equality constraints, one inequality constraint and simple bounds, in which the objective is to minimize the total cost associated with the installation and operation of the biological process. We use the software LOQO to solve the problem. Several computational results show that the quality of the effluent, especially in terms of carbonaceous matter, influences directly the cost and the main contribution to the total cost is the air flow, due to the acquirement of the electromechanical equipment and spent energy.

Suggested Citation

  • I. A. C. P. Espírito-Santo & Edite M. G. P. Fernandes & M. M. Araújo & E. C. Ferreira, 2006. "How Wastewater Processes can be Optimized Using LOQO," Lecture Notes in Economics and Mathematical Systems, in: Alberto Seeger (ed.), Recent Advances in Optimization, pages 435-455, Springer.
    • Handle: RePEc:spr:lnechp:978-3-540-28258-7_26
    DOI: 10.1007/3-540-28258-0_26
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